What is the difference between the two regex pattern

Question

I was trying to validate a company name in a web application and had this regex pattern

^[a-zA-Z_\'\\\\s,;.-0-9]{1,100}$

The above pattern

Answer 1

It's probably because of the "-" inside the character group in the first one

^[a-zA-Z_'\s,;.\-0-9]{1,100}$

Escaspe it and it should be fine.

Remember, when inside the character group the chars you have to escape become

backslash \
caret ^
hyphen -